TY - JOUR
T1 - A thermodynamic analysis on adsorption of estrogens in activated sludge process
AU - Ren, Yong Xiang
AU - Nakano, Kazunori
AU - Nomura, Munehiro
AU - Chiba, Nobuo
AU - Nishimura, Osamu
PY - 2007/6
Y1 - 2007/6
N2 - The adsorption behaviors of estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethinylestradiol (EE2), and equol were studied with a deactivated sludge subjected to heat treatment at 80 °C for 30 min. The heat-treatment hardly changed the adsorption features of activated sludge (AS). The adsorption equilibrium of all estrogens was approached within 10 min at 20 °C, and a high removal of estrogens was achieved simultaneously. The equilibrium data were well fitted by a Freundlich isotherm. The adsorption behaviors of E1, E2, E3 and EE2 in the AS system were independent of their Kow values. Thermodynamic analysis revealed that the adsorption behaviors of E1, E2, E3 and EE2 could be considered as an exothermic, physical and reversible process, resulting in their higher adsorption capacities at lower temperature. Regarding equol, its adsorption was an endothermic, chemical and irreversible process.
AB - The adsorption behaviors of estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethinylestradiol (EE2), and equol were studied with a deactivated sludge subjected to heat treatment at 80 °C for 30 min. The heat-treatment hardly changed the adsorption features of activated sludge (AS). The adsorption equilibrium of all estrogens was approached within 10 min at 20 °C, and a high removal of estrogens was achieved simultaneously. The equilibrium data were well fitted by a Freundlich isotherm. The adsorption behaviors of E1, E2, E3 and EE2 in the AS system were independent of their Kow values. Thermodynamic analysis revealed that the adsorption behaviors of E1, E2, E3 and EE2 could be considered as an exothermic, physical and reversible process, resulting in their higher adsorption capacities at lower temperature. Regarding equol, its adsorption was an endothermic, chemical and irreversible process.
KW - Activated sludge
KW - Adsorption behavior
KW - Estrogen
KW - Temperature
KW - Thermodynamic analysis
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U2 - 10.1016/j.watres.2007.01.058
DO - 10.1016/j.watres.2007.01.058
M3 - Article
C2 - 17434564
AN - SCOPUS:34247624066
SN - 0043-1354
VL - 41
SP - 2341
EP - 2348
JO - Water Research
JF - Water Research
IS - 11
ER -